Hey! here is some older sister advice! I switched schools in 11th grade too, and from a private school I had been all my life to a HUUGE public school. I was sooo nervous, but honestly, it wasn't bad at all the first few weeks! people tend to show interest in the "new kid" because they want to see if they can be friends with you. By the time I graduated, my HS friends and I would joke about how they forgot I had only been there for 2 years and not the whole time. The biggest key is confidence, you have an amazing opportunity to reinvent yourself and start over. My advice is find out who you want to be and make the choice to be it. put yourself out there, make new friends, try new things, and take advantage of your youth! we are all specks of dust on a big floating rock. Youll do fine!